* {
    font-size: 20px;
}

p {
    color: red;
    font-size: 36px;
}

div {
    color: black;
    font-size: 28px;
}

/* 类选择器 */
.brown {
    color: brown;
}

/* id 选择器 */
#pink {
    color: pink;
}

.red {
    width: 100px;
    height: 100px;
    background-color: red;
}

.blue {
    width: 200px;
    height: 200px;
    background-color: blue;
}

.my {
    height: 200px;
    background-color: skyblue;
    /* line-height: 1.5; */
}